Suction-box.



Patented Apr. 27, 1909.

J. WHiSNER.

SUCTION BOX.

APPLICATION EILED %,g m;ww v

, thereabout.

UNITED strains JOHN Winston,

earner EFlCE.

OF APPLETON, WISCONSIN.

SUCTION-BOX.

Specification of Letters Patent.

Patented April 27, 1909.

Application filed March 11, 1967. Serial No.361,849.

To a,-ZZ whom 2t may concern:

- Be it known that I, JOHN lVmsNnn, of Appleton, county of Outagamiei, State of WVisconsin, have invented an Improvement in Suction-Boxes, of which the following de-' scripiion, in connection with the accompanying rawings, isa specification, like characters on the drawings representing like parts.

This invention relates to suction boxes for I ourdrnnermachines, and other forms of paper-making machines, and pulp dryingthrough it, and flattening the. felt enables it to be presented in the best. possible'form to 1 the press rolls.

Another object of my invention is to so construct the suction box that the wear on the felt will be i'naterially reduced, thereby prolonging its life.

Another object of my invention is to so construct the suction box that it may be readily repaired.

Figure 1 shows in plan view a suction box embodying. this invention. Fig. 2 is a longitudinal vertical section of the suction box, shown in Figl 1, taken on the dotted line 22. Fig. 3 is a cross section of the suction box shown in Fig. 1, taken on the dot ed line 3-3. I

The box comprises the bottom (1, end walls a, a, side walls (1?, a and a cover. and my invention is embodied, in the lcover.

The cover comprises a rectangular open frame I), of suitable shape and dimensions to conform to -the shape and dimensions of the box, and is'adapted to be placed on the box, and to be secured thereto. The side bars and end bars constituting said open frame are formed on their inner sides with vertical rooves extendin 'from top to bottom or b b I w Bars 0, c a, (Z are lifted into the said grooves, in such manner as to be held therein, the ends of Sd1(l bars being preferably shaped to correspond to the the box is so disposed that the two sets of.

bars diverge from each other in the direction of movement of the felt or wire passing over them. -To carry out this arrangement at the middle'of the top of the box one or more pairs of short bars'c, a? are 'usedand these should preferably be inserted inthe grooves of the frame only at the real end of the box and joined together at the meeting point in some appropriate manner. It is desirable to provide some support for them at the meeting point. and accordingly I have shown the short bars (5' with an extension 6 to meet and be attached to the next bar c, or c, as the case may be. These parts a, however, are only for supporting the frail end of the short bars (:,-(l and do,n0t assist the process of smoothing the felt, accordingly if desired they may be cut away so as not to come in contact with the felt, but I .find

this unnecessary. Other forms of support, equally good for this purpose may readily be devised. The bars aremade quite narrow and of a thickness to correspond with the thickness of the frame, so that when they are fitted or slid into thegrooves therein, they will bear upon the top of the side and end walls of the box, yet, at the same time, will be flush with the top of the cover. "The spaces between the bars serve as the openings to the interior of the box, and as they extend entirely across the box they are of large area.

Byn-oviding the frame with grooves and sliding the bars 0 into said grooves, it'will be seen that any one or all of the bars may be readily removed whenever desired, and new bars substituted: but I do notdesire to limit my invention to this manner of bolding the bars. By extending the bars entirely across the box, but few openings are employed. and the wear on the felt is materiall reduced. as compared with a cover filled with circular holes or other form of cover having a large number of holes with vertical walls against the edges of which the.- shape of the grooves, so as to be slid therein. felt rubs. as it mores along. By ex enthng' the bars diagonally acrossthe box, and arranging 'thenr'in two sets, which extend from the middle of the box or thereabout toward the ri ht and left ends thereof, respectively, and disposing them with respect to, the movement of the felt so that the two sets diverge, it will be seen that as the felt passes over them it will be spread from the middle toward the sides, bysaid diverging sets of parallel bars, and thereby cause to flatten,

and all'ten'dency to curl or wrinkle is thereby obviated, and the more or less compactly arranged strands are separated, 1n order that the water may pass freely through it, and

the felt thus flattened is in' good form. to be presented to the press rolls. means which have heretofore been employed for straightening or flattening the felt are J not required.

So far as providing the box with two diverging sets of parallel bars extending from the middle of the box or thereabout to the ends thereof, is concerned, I do notdesire.

to limit my invention to the particular construction of the box or to the cover, as it isobvious that both the box and cover may 1 be otherwise formed and still provide this important feature of my invention.

- the box,

2. A suction box cover forpaper making machines comprising a frame and two diverging sets of parallel bars within said frame, the-bars of each set being separated to provide spaces between them in open communication with the interior of the box, substantially as described. 3. A suction box cover for paper making machines, having two diverging sets of-parallel bars, the bars of eachset being sepa-' rated to provide spaces between them and extending across the top of the box 1n open communication with the interior of the box,

substantially as described.

4:. A suction box for paper making machines having a grated cover conslsting of a Special box cover for paper making plurality of bars arranged in two setsacross t, the bars of the r1ght hand set extend ng the leit hand set extendingdiagonallytoward tl 1ef 1eft-,.t1 1e said two sets of bars diverging 1n the direction of movement of the in open communication with the'interi'or of the box, substantially as described.

5. A suction box for paper-making machines having a cover provided with a plurality of bars extending transversely across it and arranged withtwo sets which extend respectively from about the middle'of the box to theopposite ends thereof, the bars of one set extending in a diagonal direction toward the right and the bars of the'other set extending in a diagonal direction toward the left, and said two sets-of bars diverging which passes over the box, and the'bars of each set being arranged with spaces between 'them' in open communication with the interior of the box, substantially as described. 6.. A suction box for paper making machines having a cover provided'with a pluextei'id respectively from about the middle of the box to the opposite ends thereof, the bars of one set extending in a diagonal direction toward the right, and the bars of the other set extending-in a diagonal direction' toward the left and said two sets of bars diverging in the direction of movement of the felt which passes over the box, the bars of each set being arranged with spaces between'them in open-communication with the interior of the box, and al frame having'vertical grooves which: receiye the .rear ends-of all of said bars andy'the'; front ends of the endmo'stbars of the, two sets, and means for supporting the the middle bars of the two sets,lsubstanltiallyas described. 1 l

In testimony whereof, I have signetl my name to this,specification, in the pres'ence of two subscribing witnesses' l JOHN WHI sNnR.

' \V1tnesses:

PAUL Brown r, FRANK ZETTEL" felt which passes over-them, the bars of each g, set belng arranged with -spaces between them in the direction of movement of the feltrality of bars arranged in-two sets which front ends of diagonally toward the right and the bars of 

